The bar chart illustrates the amounts of minutes of telephone calls in Australia giving in billions by three factors over the 7 year period from 2001 to 2008: local, national and international, and mobiles.
Overall, it is clear that local telephone calls in Australia have seen little changes, however the final value stayed the same in comparison to the primary one. As well as, national and international, and mobiles calls increased by the own ways.
First of all, local calls remained some minor changes starting from 72 minutes, before it returned to the primary number at the end. Whereas national and international calls steadily rose from 38 minutes at 2001 to 61 minutes by 2008. Another factor that also had rapidly grew are mobiles, which began from approximately 2 minutes and ended by 46 in 2008
To sum up, all selected categories had some own changes over the period despite the final value.